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A077614
Let F(m,k) be the number of positive integers j <= m such that gcd(j,k) = 1; then a(n) is the number of positive integers k such that F(n,k) = k.
1
1, 0, 1, 2, 0, 1, 1, 2, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 0, 1, 0, 0, 1, 2, 1, 1, 0, 1, 0, 1, 3, 3, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 2, 1, 1, 1, 0, 2, 3, 2, 1, 1, 0, 0, 1, 0, 2, 2, 1, 1, 1, 0, 1, 0, 0, 2, 3, 0, 2, 1, 0, 0, 0, 1, 3, 1, 0, 1, 2, 1, 0, 1, 0, 1, 2, 0, 0, 0, 0, 2, 2, 1, 2, 2, 1, 0, 1, 0, 1, 0
OFFSET
1,4
CROSSREFS
Cf. A077615 (least inverse), A275257 (the F array).
Sequence in context: A333580 A375924 A219987 * A336396 A280379 A375537
KEYWORD
nonn
AUTHOR
EXTENSIONS
Name edited by Jon E. Schoenfield, Oct 27 2019
STATUS
approved